RFR: more FC4 Requests

[Jeff Johnson]

Panu Matilainen wrote:

>On Sat, 2004-11-20 at 21:23 -0500, Jeff Johnson wrote:
>  
>
>>Panu Matilainen wrote:
>>
>>    
>>
>>>On Sat, 2004-11-20 at 19:36 -0500, Jeff Johnson wrote:
>>> 
>>>
>>>
>>>Sure, people love and use it (for example the Lua-interface is a killer
>>>feature which yum currently lacks) but it's starting to seem like a dead
>>>end to me.
>>>
>>>      
>>>
>>So how should lua be made available to yum?
>>
>>Current implementation of lua in rpm is through %{lua: ...} macro 
>>constructs,
>>grotesque mainly because of the necessity to preserver a "stable" and 
>>constant
>>rpm-python interface. E.g. there is no way to simply expand a macro, one 
>>has to
>>go through the baggage of hdr.sprintf() where rpmExpand() to invoke lua 
>>happens
>>as side effect. That's obscure enough to pass for "stable", sigh.
>>
>>    
>>
>
>I'm not talking about making Lua available to yum, I'm talking about the
>mechanism which is *the* killer feature of apt-rpm, not the language
>itself. I'd take python over lua any day, it's just that Lua is easier
>and smaller to embed compared to python. In yum's case Lua doesn't make
>any sense, it's just a matter of allowing "external" python scripts to
>affect yum's functionality at certain predefined points. That's what
>apt's lua-interface is all about, and I know something like that is
>being planned for yum (IIRC under the name "xtriggers" or somesuch)
>  
>

I'm not talking about lua either. I'm talking about how an existing 
embedded and scriptable
language (which happens to not be called Forth ;-) in rpmlib might be 
made available
to applications like yum that use rpmlib in order to incorporate what 
you call a killer feature, fine
grained hooking within an installer state machine.

>  
>
>>Easy enough to rip several layers off the above, what stops is no need 
>>to do so yet.
>>
>>Hum a few notes about what you'ld like to see lua used for in yum, 
>>please. I think
>>lua has definite and positive benefits for rpm packaging, becuase for 
>>the first time
>>rpmlib can run scripts without the baggage of scriptlet dependencies. 
>>Lots of dependencies
>>would (will imho)  simply melt away if lua rather than shell were used 
>>for the 20 or so
>>common operations performed by package scriptlets.
>>    
>>
>
>Again, Lua has zero to do with this, it's all about adding similar
>customization possiblity to yum that's available in apt-rpm currently.
>  
>

Yup, lua has zero to do with this discussion becuase lua is not called 
"python" just like rpm is
not called "apt" or "yum".

73 de Jeff